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40 Eridani is the system's Flamsteed designation and ο² Eridani (Latinised to Omicron 2 Eridani) its Bayer designation.The designations of the sub-components – 40 Eridani A, B and C – derive from the convention used by the Washington Multiplicity Catalog (WMC) for multiple star systems, and adopted by the International Astronomical Union (IAU).
ο Eridani (Latinised as Omicron Eridani) refers to 2 distinct star systems in the constellation Eridanus: Omicron 1 Eridani (ο 1 Eridani), or 38 Eridani, with traditional name "Beid" Omicron 2 Eridani (ο 2 Eridani), better known as 40 Eridani , with traditional name "Keid"
39 Eridani is a binary star also divisible in small amateur telescopes, 206 light-years from Earth. The primary is an orange-hued giant star of magnitude 4.9 and the secondary is of magnitude 8. 40 Eridani is a triple star system consisting of an orange main-sequence star, a white dwarf, and a red dwarf. The orange main-sequence star is the ...
Stein 2051 is the nearest (red dwarf + white dwarf) separate binary system (40 Eridani BC is located closer at 16.26 light-years, [13] but it is a part of a triple star system). Stein 2051 B is the 6th nearest white dwarf after Sirius B , Procyon B , van Maanen's star , LP 145-141 and 40 Eridani B .
The other ship indicates that its home system in 40 Eridani is also plagued by Astrophage infection. Blip-A docks with Hail Mary, and the two ships establish first contact. Grace develops a system to communicate with the spider-like five-legged alien, whom Grace names "Rocky" due to its stone-like exoskeleton.
Theta Eridani, Latinized from θ Eridani, is a binary system in the constellation of Eridanus with a combined apparent magnitude of 2.88. [6] Its two components are designated θ 1 Eridani , formally named Acamar / ˈ æ k ə m ɑːr / (the traditional name of the system), [ 13 ] [ 14 ] and θ 2 Eridani .
The WGSN approved the name Beid for this star on 12 September 2016 and it is now so included in the List of IAU-approved Star Names. [10] In Chinese, 九州殊口 (Jiǔ Zhōu Shū Kǒu), meaning Interpreters of Nine Dialects, refers to an asterism consisting of ο 1 Eridani, 39 Eridani, Xi Eridani, Nu Eridani, 56 Eridani and 55 Eridani. [12]
Eta Eridani (η Eridani, abbreviated Eta Eri, η Eri), officially named Azha (with a silent 'h', possibly / ˈ eɪ z ə /), [8] [7] is a giant star in the constellation of Eridanus. Based on parallax measurements taken during the Hipparcos mission, it is approximately 137 light-years from the Sun .